/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina;

import java.io.IOException;

import javax.servlet.ServletException;

/**
 * A CometFilterChain is an object provided by the servlet container to the
 * developer giving a view into the invocation chain of a filtered event for a
 * resource. Filters use the CometFilterChain to invoke the next filter in the
 * chain, or if the calling filter is the last filter in the chain, to invoke
 * the resource at the end of the chain.
 * 
 * @author Remy Maucherat
 * @author Filip Hanik
 */
public interface CometFilterChain {

	/**
	 * Causes the next filter in the chain to be invoked, or if the calling
	 * filter is the last filter in the chain, causes the resource at the end of
	 * the chain to be invoked.
	 * 
	 * @param event
	 *            the event to pass along the chain.
	 */
	public void doFilterEvent(CometEvent event) throws IOException,
			ServletException;

}
